/*
* simple dropdown
*/
(function($){
	
	var toggle = '[data-toggle=dropdown]'
    , Dropdown = function (element) {
        var $el = $(element).on('click.dropdown.data-api', this.toggle)
        $('html').on('click.dropdown.data-api', function () {
          $el.parent().removeClass('open')
        })
      }

  Dropdown.prototype = {

    constructor: Dropdown

  , toggle: function (e) {
      var $this = $(this)
        , $parent
        , isActive

      if ($this.is('.disabled, :disabled')) return

      $parent = getParent($this)[0];
      isActive = $parent.hasClass('open')
	  clearMenus()
      
	  if (!isActive) {
        $parent.toggleClass('open')
        $this.focus()
      }

      return false
    }

  , keydown: function (e) {
      var $this
        , $items
        , $active
        , $parent
        , isActive
        , index

      if (!/(38|40|27)/.test(e.keyCode)) return

      $this = $(this)

      e.preventDefault()
      e.stopPropagation()

      if ($this.is('.disabled, :disabled')) return

      $parent = getParent($this)[0]
      isActive = $parent.hasClass('open')

      if (!isActive || (isActive && e.keyCode == 27)) return $this.click()

      $items = $('[role=menu] li:not(.divider) a', $parent)

      if (!$items.length) return

      index = $items.index($items.filter(':focus'))

      if (e.keyCode == 38 && index > 0) index--                                        // up
      if (e.keyCode == 40 && index < $items.length - 1) index++                        // down
      if (!~index) index = 0

      $items
        .eq(index)
        .focus()
    }

  }

  function clearMenus() {
	var parents = getParent($(toggle));
      $(parents).each(function(i,item){
		  $(item).removeClass('open')
	  });
  }

  function getParent($this) {
	 var $parents = [];
	$this.each(function(i,item){
		var $item = $(item),
			selector = $(item).attr('data-target')
    	  , $parent
    	
		if (!selector) {
      		selector = $item.attr('href')
     	 	selector = selector && /#/.test(selector) && selector.replace(/.*(?=#[^\s]*$)/, '') //strip for ie7
    	}

    	$parent = $(selector)
    	$parent.length || ($parent = $item.parent());
		
		$parents.push($parent);
	});
    return $parents
  }


  /* DROPDOWN PLUGIN DEFINITION
   * ========================== */

  $.fn.dropdown = function (option) {
    return this.each(function () {
      var $this = $(this)
        , data = $this.data('dropdown')
      if (!data) $this.data('dropdown', (data = new Dropdown(this)))
      if (typeof option == 'string') data[option].call($this)
    })
  }

  $.fn.dropdown.Constructor = Dropdown


  /* APPLY TO STANDARD DROPDOWN ELEMENTS
   * =================================== */

  $(function () {
    $('html')
      .on('click', clearMenus)
    $('body')
      .on('click' , '[data-autocpt=autocomplete]', clearMenus)
      .on('click', '.dropdown form', function (e) { e.stopPropagation() })
      .on('click'  , toggle, Dropdown.prototype.toggle)
      .on('keydown', toggle + ', [role=menu]' , Dropdown.prototype.keydown)
  })
})(jQuery);
